DESCRIPTION OF TABULATED SONOBUOY DATA All sonobuoys are identified by a number letter code. For Lamont-Doherty Earth Observatory (LDEO) sonobuoys the first three digits of the sonobuoy identification code represent the buoy number; the letters C, V, and E describe the research vessel, Conrad, Vema, and Eltanin, respectively, and the number following the letter indicates the cruise number. For example, 223C12 is sonobuoy 223 taken on research vessel Conrad cruise 12. For sonobuoys collected from sources other than LDEO, identification of the specific data is facilitated by using the buoy number identifier found in the literature, followed by a letter that refers to a specific reference in which the data first appeared. For example, 1R38 stands for sonobuoy number 1 found in reference number 38. The latitude and longitude are given in degrees and arc minutes. Minus signs indicate south latitudes and west longitudes. The water depth is in seconds. The layer velocity is km/s. All layer thicknesses have been computed for all reflection and refraction arrivals for LDEO buoys. In cases where there is a lowermost reflector layer, the computed final velocity is of the underlying "half- space" (i.e. the layer thickness is unknown). The layer determination code 1, 2, or 3 describes the technique used in the computation of the layer. The 1 indicates layer velocity determined by variable-angle reflections (interval velocity), the 2 indicates an assumed velocity, and the 3 indicated layer velocity determined from critical refracted arrivals. For non-LDEO buoys the published results were assigned a layer determination code number using the same criteria. The layer thickness is in kilometers. The total thickness is in kilometers. The total reflection time is in seconds. The rms (root-mean-square) velocity is km/s. The final column labeled "references" is an assigned reference number and indicates a specific reference in the list following this description. A zero (0) in the reference column indicates that this sonobuoy result in the LDEO collection which has not been published previously. NUMBERED REFERENCES FOR SONOBUOY RESULTS 0. The sonobuoy was repicked by R. Houtz and includes combined refraction with reflection data; the new results are previously unpublished. 1. Houtz, R., J.E. Ewing, and X. Le Pichon, Velocity of deep-sea sediments from sonobuoy data, J. Geophys. Res., 73(8), 2615-2641, 1968. 3. Leyden, R., M. Ewing, and E.S.W. Simpson, Geophysical reconnaissance on African Shelf, 1, Cape Town to east London, Am. Assoc. Pet. Geol. Bull., 55(5), 651-657, 1971. 22. Talwani, M., J. Mutter, and R. Houtz, The crystal structure and evolution of the area underlying the magnetic quiet zone on the margin south of Australia, A.A.P.G. Mem., 29, 151-175, 1979. 23. Ludwig W.J., J.I. Ewing, C.C. Windisch, A.G. Lonardi, and F.F. Rios, Structure of Colorado Basin and continent-ocean crust boundary off Bahia Blanca, Argentina, A.A.P.G. Mem., 29, 113-124, 1979. 24. Ludwig, W., C. Windisch, R. Houtz, and J. Ewing, Structure of Falkland plateau and offshore Tierra del Fuego, Argentina A.A.P.G. Mem., 29, 125-137, 1979. 29. Tucholke, B.E., R.E. Houtz, and D.M. Barrett, Continental crust beneath the Agulhas Plateau, southwest Indian Ocean, J. Geophys. Res., 86(B5), 3791-3806, 1981. 38. Hoskins, H., C.U. Rogers, and A.O. Woo, Data report of oblique reflection-refraction radio-sonobuoy profiles on the African Atlantic continental margin (R/V Atlantis II, cruises 67 and 75), Ref. 74-34, 40 pp., Woods Hole Oceanogr. Inst. Woods Hole, Mass., 1974 63. Bryan, G.M., and E.S.W. Simpson, Seismic refraction measurements on the continental shelf between the Orange River and Cape Town, ICSU/SCOR Working Party 31 Symposium, Cambridge 1971, in The Geology of the East Atlantic Continental Margin Rep. 70/16, edited by F.M. Delany, pp. 187-198, Institute of Geological Science, 1971. 64. Tucholke, B., and R. Houtz, Sedimentary framework of the Bellingshause basin from seismic profile data, Initial Rep. Deep Sea Drill. Proj., 35, 197-227, 1976. 65. Houtz, R., Continental margin of Antarctica: Pacific-Indian sector, in Continental Margins, edited by C. Burke and C. Drake, pp. 655-658, Springer-Verlag, New York, 1974. 67. Sato, S., N. Asakura, T. Saki, N. Oikawa, and Y. Kaneda, Preliminary results of geological and geophysical surveys in the Ross Sea and in the Dumont d"Urville Sea, off Antarctia, in Proceedings of the Fourth Symposium on Antarctic Geosciences 1983, Mem. Nat. Inst. Polar Res. Spec. Issue Jpn., 33, 66-92, 1984. 68. Guglielmi, M., Etude geophysique du plateau de Kerguelen, Mem. Doct-Ing. I.P.G. Strasbourg, 261 p. roneot, Univ. Louis Pasteur, Strasbourg I, 1982. 69. Ramsay, D.C., and J.B. Colwell, Rig seismic research cruise 2: Kerguelen Plateau, southern Indian Ocean-- Initial report, in Geology and Geophysics, Rep. 270, 41 pp., Dep. of Resour. and Energy, Bur. of Miner. Resour. Austr. Gov. Publ. Serv., Canberra, 1986. 70. Haugland, K., Seismic reconnaissance survey in the Weddell Sea, in Antarctic Geoscience, Symposium on Antarctic Geology and Geophysics, Madison, Wisconsin, Aug. 22-27, 1977, IUG Sci. Ser. B, vol. 4, edited by C. Craddock, pp. 405- 413, University of Wisconson Press, Madison, 1982. 71. Davey, F.J., K.Hinz, and H. Schroeder, Sedimentary basins of the Ross Sea, Antarctica, in Antarctic Earth Science, edited by R.L. Oliver, P.R. James, and J.B. Jago, pp. 533-538, Cambridge University Press, New York, 1983. 72. Childs, J.R., and H.M.J. Satgg, The deep crustal structure of the Wilkes Land continental margin, in The Antarctic Continental Margin: Geology and Geophysics of offshore Wilkes Land, Earth Sci. Ser. vol. 5A, edited by S.L. Eittreim and M.A. Hampton, pp. 99-116, Circum- Pacific Council for Energy and Mineral Resources, Houston,Tex., 1987. 73. Eittreim, S.L. and G.L. Smith Seismic sequences and their distribution on the Wilkes Land margin, in The Antarctic Continental Margin: Geology and Geophysics of offshore Wilkes Land, Earth Sci. Ser. vol. 5A, edited by S.L. Eitteim and M.A. Hampton, pp. 15-43, Circum. Pacifiic Council for Energy and Mineral Resources, Houston, Tex., 1987. 74. Recq. M., P. Charvis, and A. Hirn, Seismology-- Preliminary results on the deep structure of the Kerguelen Ridge, in Seismic Refraction Experiments, Series II, presented by J. Coulomb, C.R. Acad. Sci., 297, 903-908, 1983. 75. Francis, T.J.G., and R.W. Raitt, Seismic refraction measurements in the Southern Indian Ocean, J. Geophys. Res., 72(12), 3015-3041, 1967. 76. Goslin, J., M. Recq, and R. Schlich, Structure profonde du plateau de Madagascar: Relations avec le plateau de Crozet, Tectonophysics, 76, 75-97, 1981. 77. Hawkins, L.V., J.F. Hennion, J.E. Nafe, and H.A. Doyle, Marine seismic refraction studies on the continental margin to the South of Australia, Deep Sea Res., 12, 479-495, 1965. 78. Cooper, A.K., F.J. Davey, and G.R. Cochrane, Structure of extensionally rifted crust beneath the Western Ross Sea and Iselin Bank, Antarctia, from Sonobuoy seismic data, in The Antarctia Continental Margin: Geology and Geophysics of the Western Ross Sea, Earth Sci. Ser., vol. 5B, edited by A.K. Cooper and F.J. Davey, pp. 93-118, Circum-Pacific Council for Energy and Mineral Resources, Houston, Tex., 1987.